struts2验证失败后返回input，select中list数据丢失解决方法

解决思路：自己建立el标签，通过静态方法。

代码如下：

1: data.tld

<?xml version="1.0" encoding="UTF-8"?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"

version="2.0">

<tlib-version>1.0</tlib-version>

<short-name>myf</short-name>

<function>

<description>getAppList</description>

<name>getAppList</name>

<!-- 调用EL方法的名称 -->

<function-class>com.tongtech.em.view.application.storage.DataUtils</function-class>

<function-signature>

java.lang.String getAppList(java.lang.String,java.lang.String,java.lang.String)

</function-signature>

<example>${myf:getAppList(1,2)}</example>

<!-- 例如 -->

</function>

</taglib>

2:

类 DataUtils

package com.tongtech.em.view.application.storage;

import java.util.ArrayList;

import java.util.List;

import org.apache.commons.lang.StringUtils;

import com.tongtech.em.master.storage.AppInfo;

import com.tongtech.em.master.storage.ManagerImpl;

import com.tongtech.em.master.storage.StorageAreaInfo;

import com.tongtech.em.master.usermanager.AuthenticationService;

import com.tongtech.em.persistence.usermanager.dataobject.User;

public final class DataUtils {

public static String getAppList(String appId, String areaId, String storageId) {

ManagerImpl applicationService = new ManagerImpl();

List<AppInfo> list = new ArrayList<AppInfo>();

list = applicationService.getAppInfos(areaId, storageId);

StringBuffer temp = new StringBuffer("<select id =\"existNameSelect\" name=\"appNameExist\" theme=\"simple\" onchange=\"changeData(this)\">");

if (StringUtils.isEmpty(appId)) {

temp.append("<option value=\"\" selected>请选择</option>");

} else {

temp.append("<option value=\"\">请选择</option>");

}

for (AppInfo appInfo : list) {

if (appInfo.getAppId().equals(appId)) {

temp.append("<option value=\"" + appInfo.getAppId() + "\" selected>" + appInfo.getAppName() + "</option>");

} else {

temp.append("<option value=\"" + appInfo.getAppId() + "\" >" + appInfo.getAppName() + "</option>");

}

}

temp.append("</select>");

return temp.toString();

}

}

3:页面显示：<%@taglib uri="/WEB-INF/tlds/data.tld" prefix="myf"%>

调用： ${myf:getAppList(appInfo.appId,appInfo.areaId,appInfo.storageId)}